Polyamide Food Casing Pleat Adhesion for Shape Stability
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Solution Overview
Problem
Thermoplastic food casings used for sausage production are not suitable for forming intrinsically stable sticks without additional covering, leading to shape loss and manual handling issues, unlike cellulose casings which have complex and environmentally polluting production processes.
Innovation Solution
A shirred tubular food casing made from a blend of polyamide and/or copolyamide with a hydrophilic component, which is biaxially stretch-oriented and impregnated with a component allowing pleat adhesion, providing high water absorption and stability, preventing longitudinal expansion and ensuring mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermoplastic food casings are used for sausage production, then the production process is simpler and less environmentally polluting compared to cellulose casings, but the casings are not suitable for forming intrinsically stable sticks without additional covering, leading to shape loss and manual handling issues
Solution Approach 1:
The patent modifies the physical and chemical parameters of the thermoplastic casing by blending polyamide with hydrophilic components (polyethylene glycol, polypropylene glycol, or carboxymethylcellulose) in specific ratios. This changes the material's water absorption capacity and pleat adhesion properties, enabling the casing to form stable sticks without additional covering while maintaining manufacturing simplicity
Solution Approach 2:
The invention creates a composite material by combining polyamide (providing structural integrity) with hydrophilic components (providing water absorption and pleat bonding). This composite structure enables the casing to achieve both intrinsic stick stability and ease of manufacture, resolving the contradiction between structural performance and manufacturing simplicity
2Stability of the object's composition
If cellulose casings are used to form stable sticks, then the sticks are intrinsically stable and self-supporting, but the production process is complex and environmentally polluting
Solution Approach 1:
The patent changes the compositional parameters of the casing material by incorporating hydrophilic components into polyamide blends. This allows thermoplastic casings to achieve cellulose-like stick stability through controlled water absorption and pleat adhesion, avoiding the complex and polluting viscose production process while maintaining manufacturing simplicity
Solution Approach 2:
The invention uses readily available thermoplastic materials (polyamide and common hydrophilic polymers) that can be processed by standard extrusion methods, replacing expensive and environmentally harmful cellulose production. The casing maintains sufficient stability for its intended use as a disposable food packaging component
3Productivity
If thermoplastic casings are shirred without additional covering, then the production process is more efficient, but the sticks experience longitudinal expansion and shape loss
Solution Approach 1:
The hydrophilic components in the casing blend enable the material to self-stabilize during shirring by absorbing moisture and creating bonding between pleats. This self-service mechanism eliminates the need for additional covering materials while preventing longitudinal expansion and maintaining stick shape, thereby improving production efficiency without compromising dimensional stability
4Stability of the object's composition
If the casing absorbs high water content, then pleat bonding is enhanced and stick stability is improved, but the casing material properties may be compromised
Solution Approach 1:
The hydrophilic components are distributed within the polyamide matrix to provide localized water absorption zones at the pleat interfaces. This localized quality enhancement promotes pleat bonding and stick stability while the bulk polyamide structure maintains overall casing strength and mechanical properties
Solution Approach 2:
The composite structure combines polyamide (providing structural strength) with hydrophilic components (providing controlled water absorption for pleat bonding). This composite material achieves both pleat bonding stability and casing strength by distributing functions across different material phases
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a stable, self-supporting sausage casing that maintains shape without additional covering, suitable for automated stuffing processes, with minimal expansion and high resistance to breaking forces, addressing the limitations of traditional thermoplastic casings.
Implementation Method 1
The hydrophilic component gives the casing a swelling capacity so high that it immediately absorbs water from the impregnation applied in the form of an aqueous composition
Implementation Method 2
impregnated on the inside and/or outside with a component which allows the pleats of the casing to adhere to one another
Data Source
AI summary
Disclosed is a shined tubular food casing based on a thermoplastic blend of at least one polyamide and/or copolyamide and at least one hydrophilic component. The casing is biaxially stretch-oriented and impregnated on the inside and/or outside with a component which allows the pleats which are formed during shining of the casing to adhere to each other. The component preferably comprises at least one polymer. The casing is preferably shirred at a ratio of 80:1 to 500:1. The inventive shined casing is particularly stable from a mechanical perspective and can therefore be used especially for the production of cooked sausages, scalded-emulsion sausages, and small sausages on fully automatic sausage stuffing and clipping apparatuses.